I am about to upgrade to Leopard as well as get a Dual-Drive External which can be set as a RAID or JBOD. Not sure if I will get a 1TB now or get a case with 1 500 and get another 500 later. It occured to me that I could just get a RAID and partition it, 1/2 for TM and 1/2 for data. It also occured to me that with 10.5 resizing partitions on the fly that it might be better to partition the RAID so that I can mount the TM and data separately but resize if needed, possibly vacating the data partition if at one point I need the entire RAID for TM and then add another external for data. 1. Will this work fairly easily? Am I getting the resizing of Leopard's disk utility right? 2. If I get a case now and add 1 500GB drive for TM, can I add a 2nd later and RAID the 2 drives, given same specs and models w/o erasing the TM data, i.e. just doubling the space, or does the RAID need to be set up before any data is put on the drive(s)? Thanks for the input, and any other suggestions.